SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69cf897d3a1fbd708627ff0669935f16014b7f0d05336ac083ea016c5648295e' 
  AND token = 'm21jnzIwfOMtH1azJozH5JH4knrqVkCjpVcYyzLq+9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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