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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599bf1586cb73bc94e1b491ea45700392ae6abbcd04119e57738ea66c05c173a' 
  AND token = '1FelWYl/j4HnB1IcsH8VXwBGvleP6GwfBYNdWzViUls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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