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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a94f5b834f6faffaed6780def22a906607ea454f4195ebf6c3a17e80a50e9b63' 
  AND token = 'kls8rHmHeBAWSWwI0XWq0UlMEwkVyRM84OMLgYHHrwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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