SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b533047f49fc34fcf6f9d2252fbb1ca7a6c4772d25d42c2b285f26a70d4f4936' 
  AND token = '9LpfPQTiVVRKqMAkaiHGB/7LDXX1zYsX83wY95hxJ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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