SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7348c5e48865870208db135cdb4b2f27f81bc9a6023607f1464cda843037170b' 
  AND token = 'YM2kLWWh6JB0YgihFC5Xu46XPZZtQImTkISYqwzoQ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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