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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36ee76f20438f5eb5863e020fe320443549536e2acb75269aaeac4c9ec3d86b3' 
  AND token = 'UPpSucB+HmASJ19nJJ5jGy/vNIdIQ1QyH3S57lW+NhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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