SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4a4a620abf6ece3e90d43485532cb99f3334f59d289171499e2879e6c76079d' 
  AND token = 'bBKv3GGph/o2/CTEGDnukbGMa8rCTF0qDNVEomd6Bgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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