SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c236a825de048976113709f79c60dfd5898a44cb268d465a35542df6c6dad456' 
  AND token = 'Ttmk2FKwGpSAyhYIJthSlxWU1oo+J1m3/OisX+oJ/X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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