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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75eee415e2174cd73fc98b6ef939b987a8c468f7f9d3fb9ee83a8cc3211081ce' 
  AND token = '2pWpfz17Tmj8ERa0NRC2oAqXY3i/f4olHqwlIUQ5xws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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