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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '777d3a4c38e6a385250fd0ee6d6d39986f9aa0fd1c05f2e3747def6ebec6ab60' 
  AND token = 'Key/Aky7Es9CrBkBq+RevqXgTFuAojZXiUop8oxD61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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