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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aed6427e58e7a4e205b428e18d7e5b9a5aa7347f5d4d31ed5712928d7c8a9151' 
  AND token = 'DX96C3qnOkzO5RqLIEkfTOja6xGvtq3ym/63qluKCz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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