SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7905ef8f3818523f2b4d4784f4f8b046131a0aff4f80db70c60df3a20c694d41' 
  AND token = 'Bz4qlD41YgXYBFeAPp5CPjyCvgx4B+PzozGmI/LSxmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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