SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '811b034b93058de810f3fe26356d1d7a6b6d3c8772964375d42a34c198d42e11' 
  AND token = 'cyBwbqs/hnL+lqo21LU9zgzlvAlqzu4knc0WF3WaKRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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