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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '713f1a7591b785f705c3bcfba01f95b516fd5286b350c29653656ccfa1b5cc8c' 
  AND token = 'Nua54swGfotoN1tGMr2JTdyAzEGYqoBSHPSvJ5Ai8Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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