SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0b651af160018940430d56048e1ddc27dbc83d4271f37eb70191fe951a46331' 
  AND token = 'tnYH1XL9vBtF87HqE1EgCWl3ZChZQxYP0bReVgTx9uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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