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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20aeb83d9f75baf9ce1393bad77c4f501bfdc15619f96db9465a366b85571ade' 
  AND token = 'GoHbyDCPnDF1bah82FemCbKOCl5zo8IHz2W91se+zvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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