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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1addec42c2cdfee76dcb0c009a69a6e56793522c269a7d085d694059520d8c8' 
  AND token = 'fxuDK5NdfclcFioxak8msTG2Lfm5q2zO1kXdgxHJLrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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