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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcd5868e43d8dabf7c7a8fc589b76441a0904e7381f78d380e8f67059a9e0e1a' 
  AND token = '7TnIY7UYqV5fgUtvLNHabXCX36cCHyprXuE+P4Jxuic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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