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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f279178ad5cc00c295adca6eec70dcbf474c72d2b461faa46f12183be6d3c43b' 
  AND token = '5S3LSwLgr8X8JLFeLrhFjb65yTXQX5z1pg3843PZmhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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