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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1b1a5719f7eab8e8ef182cb48e4b70cc9beb3925da3d9d19cf34a81cf404840' 
  AND token = 'vic0Ojf3PUc2HuW9ncC19uhsi63WY2aQHJbxEyPYXnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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