SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5ebbeb2821aec72b47209f64bc42e01288a118666db11e45369fc8b014e29de' 
  AND token = 'CgkDJIwsCtVXH8CmwZDKW420jcdVWrzjwhlTouvmcJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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