SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4a052a5403162a6203be5456c3750b4353fb131788d9e2ba0dd4241c3e8ca5d' 
  AND token = '7rBQx9ArB5Py2hRyjL1VTFYIgBuD/PJwkZBrZTEwku8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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