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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9db2968c77d3506f49958f2fc611de699130ce0da9e62dc2a5ab67256fdf8799' 
  AND token = 'q8GFxnZTW65QYKbg926VJZwAe9Br13SoyxRL979Y5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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