SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58725d08b911597e693fe6030ac7c6eaa00d0ca05b413974a65a8d6307471522' 
  AND token = 'CuIQziQCnNTQ8JdEHcZq6GmxOQ+w5rwkEF3Oo9Yh+wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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