SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4825de4720453864dbec8289893c39596cd07d36700b6c637614303b5814c1f1' 
  AND token = 'A4hVdP/AMNBisv/9iv1sPYtbG9dGGAHUM9JDYZouKCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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