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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '553f70573536ecba10a57cd2ddc429e909affb9863a52df017a539dc7cca0294' 
  AND token = 'k59Tk8ieEGpLJq73QaE/ttuQhm2T0NmCpp+0CmbK7T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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