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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '507a569ac0407b9a2122b62d0a1489a470f910d0f42b626a365f4286e89bcf4f' 
  AND token = '7M506lrMtCXt0WEwudjLVPku0HUVaStc4Tb4MIe+B8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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