SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9557d4c96064686523d9e4b4c34d9b7b14a8455792c1ad1ee8c5fac2c2e7edd1' 
  AND token = 'kSLXEUYVyZGaM5bT3kX5fefUQ/XWJglPYnYM+zt69Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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