SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '197433e6245f09982b59ce76ef49cac5c7a739a86ce6ebf09805cc87e8514a60' 
  AND token = '/hWNCFzstD/vVjWtWKOIFv1YQF18WLNlQV7q+6JG//c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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