SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f8c68447f75c2c0a2b23ea06bd42f9961249f39bc414a6657660c97a9ca1b1c' 
  AND token = '1xNPJ80hi+A/DUXuLYvaZJP7yLneLslUvLRSaqVz2cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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