SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e89de7a42c1547c9d9cf7e4b40f2531de9005245795ef3ad6fc34049fe54405' 
  AND token = 'gKYtvKTAc1dPpDX3jzZ9g/JAAFzKhjJpk9mXEsafQGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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