SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91dfd7411c492e5ef6c90f9c96b5b50da79ad895396e341f843346561fb370fd' 
  AND token = 'Jz8Rwn2ovY22gnC2acK3+ya/mUrtdEFUuFgEpNOAdyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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