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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d86c66dcd3fdddcf0dcbd9f3957e3815096b232581250d88918dbad2d140281' 
  AND token = 'fzoRPUPZ9BAQIb7YJa5Hz14LcWEHivwpzekoH7Tvu6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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