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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66e70f37a8b70353e77b6b8adeebd99aa5fa8d8c9bcd5c723dd9083f56fee156' 
  AND token = 'QwqtUWoKgoBJ6CU3fw5OUIrd+a8NJO9562ip3kU2Jz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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