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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46c1659ddbf59d164c560f1196d57e6ecfd230142b5953bbb4c31fc969d646f5' 
  AND token = '8E5FsIbjxuyGKYrwgzCFv6OSSjuqPsa1KgePloU0v7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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