SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54b763a0f954f6175685ed7677db7fc21afc2038a49b7751737802f5f5ffa52e' 
  AND token = 'UkZb8wo8jmjg2jEogH0QcRwxyYatXXJcBzKsE5PDQSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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