SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0653cef51a5681b93cc95348735307e7db51a3ce252191c5be621b2ff5e7115' 
  AND token = 'gjuly9iQnaGqGwhKm0qR5wgNXgdbj2hmXcKHTUPZCUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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