SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a89862f5774d0238930c11f9dfcc13d04e69da78701cacd9f65057c18675e4b' 
  AND token = 'P/gZKtEsxlhz/Xv1x8RVHyz9GRN2bMzF+Y3UoWxWh7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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