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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '037e1b79309fe928cd0ee91640b0fb34bcecd135763dd2eee096c2c4a4f90997' 
  AND token = 'iBZ3TbUkhu19IolKMI650d+b8wcYejq2kxwPc5Zm5XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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