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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5870f613d77626090b2a2322c61d73814167469c0cd9097d217ab5c70f6ead2b' 
  AND token = 'xWvO9Z+m64Pq7k6b/RPy5ahQ88i8aF4hivl7fg6ShYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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