SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933e9882a50aac624384720c3895f2a174fafe46be63d11bc27632bd5c233b24' 
  AND token = 'DI0PuDj4GEEWwWoxNFV4ZvBYhYBel1RCiob6yw+fQ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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