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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bba1a7872028690b8a978233e03a4f7f594e08b636a6cdc246cd83a84b7f9233' 
  AND token = '6dqxOiflyX6drewC2R/OuNHX1mwIv+0o56+vQcC/owo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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