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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9f24aa09ceba3364a3e6c4a1b08a61ea9403cca25fcd9f08b56598d6fe15c68' 
  AND token = '5+TTscoNy8vNYXOOaimgAJfqvGUp/S4UaX4LA2G6kpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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