SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '055dae524ec7300f069f32429a8285ed611a7c7c04fe07e2bd1ca2d4b6a16a73' 
  AND token = '845frYqTy6o0CGqM+LQb2nAY+v1wKj8P3VnJ+HjhOrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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