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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af7beb90460d0a29d5a0f6bbe3a15f5536bf29b1b530be60df2295c08c99fbf8' 
  AND token = 'jAtgEE6ubATzsDfxfNOxqX6GWX8SNEcaaRkKzwGqb34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}