SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '225544a078a329666ca511f4c483a247c7f01440dcb733d1173fd108fb23235b' 
  AND token = 'qLVeHge8PiQP5PGxqvQEulW4LXYQCGVLWCqZ/kgmu6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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