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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a580d79a438581008136c3e5e7b7b28307b0e857dcc761f72b88fe8883600f68' 
  AND token = 'r8eukns06oGTlUctUK8kyk6Wu6ZQGS0KiabeUTKlz6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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