SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6adeaafb5574271ef23e6315385d8b95582ce9f99e2b0317449e1dc13c6b7d77' 
  AND token = 'HBvVXC/vWpo3IcPjMX1dYdA6O//g+PQzJWvKFQKpXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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