SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbd7e56e70359f19281a3f64f3976574db932ed135b28141d8a1726a76f52117' 
  AND token = 'cg6TWOkmjoSrHCDaOqnK6MiBfozfBoG3D/K3gW4LIkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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