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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b555bc95cc56b45dcdaf4daf1c7304c39f43ecf1ffe2ec2ea30f3b867ac694f8' 
  AND token = '3qozfXYU98hCybCzmLV6sEa4MIRMrxfUMrZyQdi56Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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