SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6da9d9d6207d9fda38e26b93c26ddf06e31b538f9c5e5b789ea55af1e1595670' 
  AND token = '7tgT5ccDJC0c+vPZLg/sqDoxBkz1wLh3q1RX2oCtZAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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