SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0043d5d3506002c489a0bcc7a0201f092888fac26501a762663e8846851062b' 
  AND token = 'LgpqgHV+xq609QI4wHpRGS9t7a5m4PnoLVNaQzlJkZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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