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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c609dbc7d16abc40b506cfd7a1269ea5f0c5b536da64ed5c7ac818772e8e7a81' 
  AND token = 'pbC2XtAK5YmfE+aQTIMw41UMnGg5sx+vFGZN5oNjVLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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