SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1fe8b284da9752b2b508a66a34368ea753c975d802d260d1d1c4d3ffb0ae7a9' 
  AND token = 'xWEEV8z1yVYxchba7Vg2GSeJyKkY+1wLv4FHUMhwYnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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