SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08bbf2b78aa05bf8d410f8fa4e8e26ffa6e35c66262785fa70e0a8ea7919696b' 
  AND token = 'GzWY6DdRXZjjq04fAcFCwaHLvoH+O5atUSIMOThKGwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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