SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ccac33b20d3291cd7798f0d42d2fe909763a75ab8f91d1363476e26eca4644c' 
  AND token = 'BhtOd9brGJedQPtCcYKRFJyM4iQCIHv/5sxw+JYxbFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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