SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a5b955a46829f5e767b6c660c1c3cde7d0d626456a7eb9b9f9eba3656e0e9c3' 
  AND token = 'mwRVCFaqhggQyi1jtTTR+Lh2wP8mio71oHzGYY5cASM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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