SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd0c80fa8a64989e91e85f4c4ae85f25919599f9282df67599131cf4f4314584' 
  AND token = 'G1STWrIDzJx0C4gFunMIs/VLxqQJywVbtT5b67yk+Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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