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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86e40fdafaef153d232b4385c65d94dc9de9fcbddc5f72f153ba6e68866dc572' 
  AND token = 'mb/1tWjEE7cY1LTv8e2D56V1ruAiP6RwdAfjSYyCZ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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