SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'befdeaee598a641360525c4c7efeba98a3bf435ba177fb9d19904861c3438049' 
  AND token = 'SbDQX2pACwdOBo3Dhu/UbxJu0BrNRz/B4swWW+fLDgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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