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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c446c85741cf6b757dbb40c21dea025a7a52113bf70457e8d2017556ae590f0a' 
  AND token = 'X8tv4/Yvifx76eDbKdJkXfpdn2/g18sxlxASkHuXOq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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